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LF: Re: TC44/MUR1660 question...thanks.....

To: [email protected]
Subject: LF: Re: TC44/MUR1660 question...thanks.....
From: "Johan Bodin" <[email protected]>
Date: Wed, 21 Jan 2004 10:20:33 +0100
References: <[email protected]><[email protected]><[email protected]> <[email protected]> <003d01c3dfa3$4766f960$2102000a@ibm>
Reply-to: [email protected]
Sender: <[email protected]>
Hello Dick and the group,

there are many MOSFET drivers on the market.

Some examples:
 Maxim MAX626/627/628 www.maxim-ic.com
 International Rectifier IR21xx / IR21xxx www.irf.com
 Intersil HIP408x, ICL7667 www.intersil.com
 Elantec EL7002/7012/7022 www.???
As Alan mentioned, a dedicated driver IC is not always necessary.
The MOSFET gates can be adequately driven by a simple
complementary transistor buffer unless extremely fast rise/fall
times are required.


Probably my first experimental 137kHz set-up will be something
like the DF3LP "impatient design", simple straight in the old
fashioned way...

It is equally easy to build a "true" class E amplifier which has many
advantages. When properly tuned, it runs amazingly cool and class E
is inherently free from "MOSFET killer" voltage spikes.
The transistor current is very low at the switching instants so the drive
waveform is not very important, it can be quite "non-square" (it should
have 50% duty cycle though). Some HF class E designs even use
sine wave drive! The only downside that I can think of is that the
"transistor utilization factor" is quite low - less output power per
transistor when compared to some other amplifier topologies such
as class D. The reason is simply that the peak drain voltage in a
class E amplifier is almost 4 * supply voltage...

Jim Tonne has written a nice little program for class E design,
CLASSE101.ZIP is available here:

http://www.qsl.net/wb6bld/classe.html

Also, have a look at SOKAL.ZIP on the same page. It contains
a PDF paper with general information about class E. It was
written by Nathan Sokal, "Mr Class E" himself :-)

73
Johan Bodin, SM6LKM



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